Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Carroll County, Kentucky
EPA puts Carroll County in Zone 2, its middle radon zone, and only 26 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
45.8%
Jefferson County
- Jefferson
- 45.8%
- Owen
- 36.2%
3 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
36.6%
Henry County, 15 miles
- Henry
- 36.6%
- Kentucky
- 43.7%
Share at 4+ pCi/L, 41 tests, 2008 to 2017
Ground above low
100.0%
5.7 pts above Kentucky
- Carroll
- 100.0%
- Kentucky
- 94.3%
Share of land USGS rates moderate or high potential
Tests reported
26
Too few for a share
- Carroll
- 26
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Carroll County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
Carroll County, At a glance
Carroll County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Carroll County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Carroll County, 2008 to 2017, laboratory
CDC holds 26 reported tests for Carroll County over the 2008 to 2017 laboratory totals, with a median of 3.5 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Carroll County beside the counties around it is how this page reads it.
What these figures count
Only 26 tests were reported to CDC for Carroll County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Carroll County, Compared
Carroll County radon figures, compared
Calculated by Radon411CDC's largest figure for Carroll County rests on 26 tests over the 2008 to 2017 laboratory totals, 10 of them at or above 4 pCi/L, so each test moves its share by 3.8 points and no rank or comparison is drawn from it. Results reached as high as 7.7 pCi/L, with a middle value of 3.5 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Jefferson County, IN reported the largest share at or above 4 pCi/L, 45.8%, and Owen County the smallest, 36.2%, with Henry County at 36.6% between. Farther out, Oldham County (26 miles away) at 37.1%, Grant County (27 miles away) at 33.3% and Boone County (30 miles away) at 42.9% have figures too. Pooled across 120 Kentucky counties, 43.7% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Meade County reported the highest share (68.4%) and Hopkins County the lowest (9.5%). EPA's 1993 map puts Carroll County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Carroll County, Geology
The ground under Carroll County
PredictedUSGS's geologic map puts all of Carroll County's mapped land in one class: moderate radon potential. 99.4% of it lies in the area the map calls Outer Bluegrass, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Outer Bluegrass | Ordovician-Devonian limestone and shale. | Moderate | 11 | 99.4% |
| Dearborn Upland | Ordovician through Devonian limestone, dolostone, and gray shale, and pre-Wisconsinan glacial deposits. | Moderate | 10 | 0.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Carroll County beside the ground around it
Across Kentucky 18.2% of the land is rated high; none of Carroll County's is. Of the 6 counties that border it, 3 have more high-potential ground, Jefferson County, IN the most at 23.8%.
The map rates the ground, not the air in any home.
Local help
Carroll County, Local resources
Radon testing and mitigation in Carroll County
- Kentucky's radon programKentucky Board of Radon SafetyKentucky's radon program answers questions about testing, mitigation and the rules in Kentucky.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Kentucky8 professionals are listed in Kentucky.
What Kentucky's program says
- Phone
- 502-782-2782
- Radon@ky.gov
What it means
Carroll County, Questions
Questions about radon in Carroll County
Are radon levels high in Carroll County?
Over the 2008 to 2017 laboratory totals, 38.5% of the radon tests reported to CDC for Carroll County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Jefferson County, IN reported the largest share at or above 4 pCi/L, 45.8%, and Owen County the smallest, 36.2%, with Henry County at 36.6% between.
Which counties border Carroll County?
Carroll County borders 6 counties: Switzerland County, IN, Trimble County, KY, Gallatin County, KY, Henry County, KY, Owen County, KY and Jefferson County, IN.
Products
Carroll County, Products
Testing a home in Carroll County
No CDC figure names Carroll County; the nearest county with one, Henry County (15 miles away), reported 36.6% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Carroll County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Carroll County, Bordering counties
Counties bordering Carroll County
Calculated by Radon411- Radon levels in Trimble County, KYEPA zone 2
45.8%at or above 4 pCi/L
Median 3.7 pCi/L · 24 tests
- Radon levels in Jefferson County, INEPA zone 2
45.8%at or above 4 pCi/L
Median 3.1 pCi/L · 72 tests
- Radon levels in Henry County, KYEPA zone 2
36.6%at or above 4 pCi/L
Median 3.2 pCi/L · 41 tests
- Radon levels in Owen County, KYEPA zone 2
36.2%at or above 4 pCi/L
Median 2.5 pCi/L · 58 tests
- Radon levels in Switzerland County, INEPA zone 2
33.3%at or above 4 pCi/L
Median 1.5 pCi/L · 15 tests
- Radon levels in Gallatin County, KYEPA zone 2
25.0%at or above 4 pCi/L
Median 2.5 pCi/L · 24 tests
Carroll County, Cities and towns
Cities and towns in Carroll County
The Census Bureau estimates 11,141 residents in Carroll County for July 1, 2025, 310 more than in 2020 (+2.9%). That works out to 87 people per square mile of land. Its largest town, Carrollton, has 3,964 residents, 35.6% of the total. Together its 5 incorporated places hold 43.9% of those residents; the other 56.1% live outside any of them. Reported testing is thin here: 26 tests over 2008 to 2017, or 2.3 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.
From Carrollton to Prestonville, CDC publishes no figure by town: each reads Carroll County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Carrollton | 3,964 | +1.8% | 35.6% |
| Ghent | 368 | +0.5% | 3.3% |
| Sanders | 204 | +3.6% | 1.8% |
| Worthville | 179 | +2.9% | 1.6% |
| Prestonville | 178 | +2.9% | 1.6% |
5 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Carroll County, Homes
Homes in Carroll County
Of Carroll County's 4,682 homes, 63% are detached houses, against 68% across Kentucky; 20% are mobile homes. Half of its homes were built before 1983, close to Kentucky's 1982: 22% date from before 1960 and 21% from 2000 or later. 64% of occupied homes are lived in by their owner (Kentucky: 68%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Carroll County | Kentucky |
|---|---|---|
| Housing units | 4,682 | 2,010,655 |
| Detached houses | 63% | 68% |
| In buildings of 5 or more | 8% | 12% |
| Mobile homes | 20% | 11% |
| Built before 1960 | 22% | 22% |
| Built since 2000 | 21% | 24% |
| Middle year built | 1983 | 1982 |
| Owner-occupied | 64% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.